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    <title>服务器错误 - 50x错误</title>
    <style>
        body {
            font-family: 'Arial', sans-serif;
            text-align: center;
            padding: 50px;
            color: #333;
            background-color: #f8f9fa;
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        .container {
            max-width: 600px;
            margin: 0 auto;
        }
        h1 {
            font-size: 3rem;
            color: #ffc107;
            margin-bottom: 20px;
        }
        p {
            font-size: 1.2rem;
            margin-bottom: 30px;
        }
        .error-code {
            font-weight: bold;
            color: #6c757d;
        }
        a {
            color: #007bff;
            text-decoration: none;
            font-weight: bold;
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        a:hover {
            text-decoration: underline;
        }
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    <div class="container">
        <h1>50x</h1>
        <p>抱歉，服务器暂时无法处理您的请求。<span class="error-code">错误代码: 500, 502, 503 或 504</span></p>
        <p>请稍后再试，或者联系系统管理员获取帮助。</p>
        <a href="javascript:history.back()">返回上一页</a> 或 <a href="/">返回首页</a>
    </div>
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